Maintaining pressure in superheaters



(No Model.)

I D. RENSHAW.

MAINTAINING PRESSURE IN SUPERHEATERS.

Patented Oct. 2, 1883..

WITNESSES orney UNITED STATES PATENT OFFICE.

DAVID RENSHAWV, OF BRAINTREE, MASSACHUSETTS.

MAINTAINING PRESSURE IN SUPERH EAjTERS.

SPECIFICATION forming part of Letters Patent No. 285,843, dated October2, 1883,

Application filed February 24, 1883.

To all whom it may concern;

Be it known that 1, DAVID RENSHAW, of Braintree, in the county ofNorfolk and State of Massachusetts, have invented certain newandusefullmprovements in MaintainingPressure in Superheaters; and I dohereby declare that the following is a full, clear, and exactdescription of the invention, which will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanyingdrawings, and to the letters of reference markedthereon, which form part of this specification.

The object of this invention is to maintain in superheaters a pressuregreater than that due to the source of their supply; and, further, towiden the range of usefulness of such superheaters, by this meansfitting them for use as blowing and fluXing engines high-pressuresteam-boilers, 85c.

It consists in first producing the desired working pressure on asuperheater, and then maintaining such pressure by means of inj ection,in connection with water, of atmospheric pressure, while carryingcontinually a portion of the superheated bodies to the work to be doneor accomplished by them.

It further consists in providing minor mechanical means for theprevention of injury to superheaters so used, by interposing betweenthem and the injector and the furnace a subsidiary heater, so arrangedand of such material as to permit of the injection into it, While underhigh temperatures, of liquid spray, or even water; also, for providingfor the pro duction of fluxing-gases,,in combination with steam in theapparatus, and over the furnace or other source, as hereinafter morefully set forth.

In the accompanying drawings, Figure 1 shows a front elevation of myinvention; and Fig. 2 shows a side elevation of the same in section.

Referring more particularly to said drawing, A is the superheater.

B B is a boiler of low pressure, which may I be used for the preparationof filming-gases,

or steam of a denser body, which intermingles in the superheater withthe superheated steam.

G is a subsidiary heater, into which the (No model.)

superheated steam or gases, and water and gases of denser body-such ashydrocarbon, &c.are first injected, that any water remaining in themixture, as water, may be brought to the condition of steam beforeentrance to the superheater proper. G, I prefer to make of brass tubing.

D is the brickwork of the superheater.

E is a co1d-water tank, located over the delivery stand-pipe of thesuperheater, from which a sufficient quantity of water is let into thesnperheater before starting the fire,which,

. when made into superheated steam, will give the pressure at which itmay be desiredto work said superheater, thus forming a simple way ofputting the apparatus into operation.

f is a pipe connecting the low-pressure boiler B with injector S, andwhen gases or fluids other than steam are used they enter pipe f throughthe valve 3.

0 is a valve in pipe f, below valve 8.

g is a pipe for carrying superheated steam or gases from the superhcaterto the work to be done.

h is a pipe leading from the front or hottest part of the superheatcr tothe injector, located in rear of the same.

K is a valve controlling the outlets from the superheater.

M is a water-tank, which may be located in any suitable position, and ais a pipe connecting the same with the injector S. Of course, this watersupply may be taken from some other source than the tank, but in allcases would be led to the injector S by pipe n.

It will be seen that this process has a wide range of uses, and itsdetails may be greatly varied without departing from the spirit of myinvention.

Having now fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is- I 1.The process herein described of mam- This subsidiary heater tainingpressure greater than the source of 5 supply, which consists of firstsupplying the superheater with the desired quantity of water for workingpurposes, then taking steam or gases of greater density than thesuperheated steam, which may be fluxing or other gases, then conveyingthe superheated steam and said gases into an injector, by which the mix-IOO purposes, as set forth.

ture, is forced into a subsidiary heater, and then to the superheater,where it is maintained at a greater pressure for working or blowing 2.The process of maintaining pressure greater than the source of supply,consisting of first raising steam in a superheater for working purposes,then conveying denser gases or fluids (which may be of a fluxingcharacter) to the injector, in which they are brought in contact withsuperheated steam and water at at mospheric pressure, by which theresultant mixture is forced into a subsidiary heater, where its volumeis increased, and thenceto the ;uperheater, to be used for the purposesset orth.

3. Thecombination of means for maintaining pressure in a superheatergreater than the source of supply, consisting of the Vessel B,

tions, substantially as set forth.

In testimony that I claim the foregoing as I my 'own invention I affixmy signature in presence of two witnesses.

DAVID RENSHAW.

Witnesses:

B. F. MORSELL, EUGENE D. CARUSI.

